TY - JOUR
T1 - Photocatalytic properties and photoinduced hydrophilicity of surface-fluorinated TiO2
AU - Tang, Junwang
AU - Quan, Hengdao
AU - Ye, Jinhua
PY - 2007/1/9
Y1 - 2007/1/9
N2 - Surface-fluorinated TiO2 was prepared with the help of anhydrous hydrogen fluoride (AHF) via vapor-phase fluorination at 473 K for 2 h and characterized by XRD, SEM, UV-visible diffuse reflectance, Raman, XPS, and ATR-FTIR, respectively. XRD and UV-visible diffuse reflectance show that fluorination does not change the bulk crystal structure and optical absorption of TiO2 under the above-mentioned preparation condition. However, the photoinduced hydrophilicity, photocatalytic H2 evolution, and organic contaminant decomposition are greatly improved by the insertion of fluorine. XPS, ATR-FTIR, and Raman measurements of TiO2 and surface-fluorinated TiO2 reveal that fluorination remarkably increases the adsorption of polar molecules, including water and some organics, which is mainly attributed to the enhancement of surface acidity, and the formation of the surface hydroxyl radicals, which is beneficial for both photocatalytic oxidation reaction and hydrophilicity. Therefore, as expected, H2 evolution from water, aldehyde decomposition, and methylene blue degradation increase, and water contact angle decreases, on the surface-fluorinated TiO2 under UV light irradiation.
AB - Surface-fluorinated TiO2 was prepared with the help of anhydrous hydrogen fluoride (AHF) via vapor-phase fluorination at 473 K for 2 h and characterized by XRD, SEM, UV-visible diffuse reflectance, Raman, XPS, and ATR-FTIR, respectively. XRD and UV-visible diffuse reflectance show that fluorination does not change the bulk crystal structure and optical absorption of TiO2 under the above-mentioned preparation condition. However, the photoinduced hydrophilicity, photocatalytic H2 evolution, and organic contaminant decomposition are greatly improved by the insertion of fluorine. XPS, ATR-FTIR, and Raman measurements of TiO2 and surface-fluorinated TiO2 reveal that fluorination remarkably increases the adsorption of polar molecules, including water and some organics, which is mainly attributed to the enhancement of surface acidity, and the formation of the surface hydroxyl radicals, which is beneficial for both photocatalytic oxidation reaction and hydrophilicity. Therefore, as expected, H2 evolution from water, aldehyde decomposition, and methylene blue degradation increase, and water contact angle decreases, on the surface-fluorinated TiO2 under UV light irradiation.
UR - http://www.scopus.com/inward/record.url?scp=33846445292&partnerID=8YFLogxK
U2 - 10.1021/cm061855z
DO - 10.1021/cm061855z
M3 - Article
AN - SCOPUS:33846445292
SN - 0897-4756
VL - 19
SP - 116
EP - 122
JO - Chemistry of Materials
JF - Chemistry of Materials
IS - 1
ER -